Surface mount assemblies for a solar panel system

ABSTRACT

Surface mount assemblies for mounting to a solar panel frame to an installation surface are disclosed. In some embodiments, a base is coupled to a height-adjustable rail mount to slidably couple a track with a fastener assembly that includes of a fastener, spacer, and nut. In some embodiments, a base is coupled to a rail mount and positioned on a base plate to slidably couple to a surface track with a fastener assembly that includes a first fastener slidably coupled to a groove formed by the track, spacer, and second fastener. In some embodiments, a base is coupled to a rail mount for slidably coupling the rail to a height-adjustable base with a fastener. In some embodiments, a two-configuration, track-mounted, rectangular base is designed with a rectangular base having a pair of short-sided legs, a pair of long-sided legs, and a fastener for engaging outer surfaces of a track.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 17/336,170, filed Jun. 1, 2021, which is a divisional of U.S. patent application Ser. No. 16/113,516, filed Aug. 27, 2018, which issued on Sep. 7, 2021, as U.S. Pat. No. 11,114,974 which claims the benefit of U.S. Provisional Application No. 62/550,120 filed on Aug. 25, 2017, entitled “Height-Adjustable Surface Mount Assemblies for a Solar Pnale System.” which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

The present invention relates to solar panel systems, and in particular, to mounting assemblies installed to installation surface of a solar panel system.

BACKGROUND

Solar modules may be mounted to an installation surface, such as a roof, using surface mount assemblies. Due to imperfect installation conditions, such as uneven installation surfaces and physical differences between the various solar modules that make up an array, surface mount assemblies may be need to be height adjustable in order to achieve a level installation. Accordingly, it would be desirable to employ surface mount assemblies with adjustable heights.

SUMMARY

Embodiments of the inventive concepts disclosed herein are directed to height-adjustable surface mount assemblies to which a solar module frame of a solar module or an array of solar modules may be suspended above the installation surface.

In one aspect, embodiments of the inventive concepts disclosed herein are directed to a surface mount assembly for mounting to a solar panel frame to an installation surface. The assembly could include a base, a track, a plate with a raised portion that includes an aperture(s) extending away from a surface of the raised portion.

In a further aspect, embodiments of the inventive concepts disclosed herein are directed to a fastener assembly for mounting to a solar panel frame to an installation surface. The fastener assembly could include a first fastener, a second fastener, and a spacer, where threads of the first fastener engage a threaded aperture of a first end of the spacer and threads of the second fastener engage a threaded aperture of a second end.

In a further aspect, embodiments of the inventive concepts disclosed herein are directed to a threaded cap for mounting to a solar panel frame to an installation surface. The threaded cap could include an outer shell, and an inner concentric, threaded cylindrical member.

In a further aspect, embodiments of the inventive concepts disclosed herein are directed to a track for mounting to a solar panel frame to an installation surface. The track could include a left side, a right side, an inner surface, and an outer surface which includes a first vertical wall, a second vertical wall, a horizontal wall, a first aperture, and a horizontal flange.

In a further aspect, embodiments of the inventive concepts disclosed herein are directed to a structural component for mounting to a solar panel frame to an installation surface. The component could include a left side, a right side, an inner surface, and an outer surface which includes a first flange, a second flange, a third flange, a first aperture, and a second aperture.

In a further aspect, embodiments of the inventive concepts disclosed herein are directed to a structural mount assembly for mounting to a solar panel frame to an installation surface. The assembly could include a hollow rectangular component, a first diagonal member, and a second diagonal member.

BRIEF DESCRIPTION OF THE DRAWINGS

For a fuller understanding of the inventive embodiments, reference is made to the following description taken in connection with the accompanying drawings in which:

FIG. 1A illustrates a perspective cutaway view of a first surface mount assembly including attaching hardware, in accordance with some embodiments;

FIG. 1B illustrates an exploded view of the first surface mount assembly including attaching hardware, in accordance with some embodiments;

FIG. 1C illustrates a perspective view of a track and alternative attaching hardware of the first surface mount assembly, in accordance with some embodiments;

FIG. 1D illustrates an exploded view of the track and alternative attaching hardware of the first surface mount assembly, in accordance with some embodiments;

FIG. 1E illustrates a side view of the track and first alternative hardware of the first surface mount assembly, in accordance with some embodiments;

FIG. 2A illustrates a perspective cutaway view of a second surface mount assembly, in accordance with some embodiments;

FIG. 2B illustrates a perspective view of a base plate of the second surface mount assembly.

FIG. 3A illustrates a perspective view of a third surface mount assembly coupled to a rail, in accordance with some embodiments;

FIG. 3B illustrates a perspective view of a spacer of the third surface mount assembly, in accordance with some embodiments;

FIG. 3C illustrates a cutaway perspective view of the spacer of the third surface mount assembly, in accordance with some embodiments;

FIG. 3D illustrates an exploded view of the spacer of the third surface mount assembly, in accordance with some embodiments;

FIG. 4A illustrates a perspective view of a fourth surface mount assembly, in accordance with some embodiments;

FIG. 4B illustrates an exploded view of the fourth surface mount assembly, in accordance with some embodiments;

FIG. 4C illustrates a perspective cutaway view of the fourth surface mount assembly, in accordance with some embodiments;

FIG. 4D illustrates a side view of a track of the fourth surface mount assembly, in accordance with some embodiments;

FIG. 5A illustrates a perspective view of a fifth surface mount assembly, in accordance with some embodiments;

FIG. 5B illustrates an exploded view of the fifth surface mount assembly, in accordance with some embodiments;

FIG. 5C illustrates side, top, and bottom views of an extender of the fifth surface mount assembly, in accordance with some embodiments;

FIG. 6 illustrates a perspective view of a sixth surface mount assembly, in accordance with some embodiments;

FIG. 7A illustrates a first perspective view of a track-mounted rectangular base, in accordance with some embodiments;

FIG. 7B illustrates a first exploded view of the track-mounted rectangular base, in accordance with some embodiments;

FIG. 7C illustrates a first side view of the track-mounted rectangular base, in accordance with some embodiments;

FIG. 7D illustrates a second perspective view of the track-mounted rectangular base, in accordance with some embodiments;

FIG. 7E illustrates a second exploded view of the track-mounted rectangular base, in accordance with some embodiments; and

FIG. 7F illustrates a second side view of the track-mounted rectangular base, in accordance with some embodiments.

DETAILED DESCRIPTION

In the following description, several specific details are presented to provide a thorough understanding of embodiments of the inventive concepts disclosed herein. One skilled in the relevant art will recognize, however, that the inventive concepts disclosed herein can be practiced without one or more of the specific details or in combination with other components. In other instances, well-known implementations or operations are not shown or described in detail to avoid obscuring aspects of various embodiments of the inventive concepts disclosed herein.

The surface mount assemblies disclosed herein may be employed to adjust the height of an array of solar modules suspended above an installation surface. The height-adjustable surface mount assemblies may be coupled to the installation surface and used to support the solar modules at desired levels above the installation surface.

FIGS. 1A and 1B illustrate perspective and exploded views, respectively, of first surface mount assembly 100. Height-adjustable mount 101 is slidably coupled to base 102 with fastener 103 extending through an elongated aperture as shown. Fastener assembly comprised of track fastener 104 a, spacer 104 b, and base fastener 104 c slidably engages track 105 that may be attached to an installation surface (not shown). In some embodiments, base fastener 104 c is comprised of cap 104 d and threaded insert 104 e. Base plate 106 includes raised portion 107 having an aperture 108 rising above or protruding from base plate 106. Except for raised portion 107, the shape of base plate 106 is flat.

The fastener assembly couples base 102 to track 105. A threaded end of track fastener 104 a extends through a groove of track 105 to threadably engage complementary threads of a lower portion of spacer 104 b, and a threaded end of base fastener 104 c extends though apertures 107 and aperture 102 a of base 102 to threadably engage complementary threads of an upper portion of spacer 104 b. In some embodiments where base fastener 104 c is comprised of cap 104 d and threaded insert 104 e, a lower portion of a threaded insert 104 e that threadably engages complementary threads of an upper portion of spacer 104 b while an upper portion of threaded insert 104 e extends through apertures 107 and 102 a to threadably engage complementary threads of an upper portion 104 f of cap 104 d. In some embodiments, lower portion 104 g of cap 104 d is conically flared to cover aperture 102 a when aperture 102 a is positioned over or against aperture 108 as cap 104 d is secured against base 102.

FIG. 1C through 1E illustrate two perspective views and one side view, respectively, of components of an alternative fastener assembly for slidably engaging track 105. As shown, track fastener 104 i could be a bolt extending through a spacer 104 j for slidably engaging track 105.

FIGS. 2A and 2B illustrate perspective views of second surface mount assembly 110. With the exception of base plate 106, the components shown in FIGS. 1A and 1B are the same for second surface mount assembly 110. As shown, base plate 116 includes raised portion 117 having an aperture 118 rising above or protruding from base plate 116. Except for raised portion 117, the shape of base plate 116 has a curved shape which could be employed to fit on a surface having a matching or complementary contour.

FIG. 3A illustrates a perspective view of third surface mount assembly 120, and FIGS. 3B through 3D illustrate perspective, cutaway perspective, and exploded view, respectively, of spacer 127. Referring to FIGS. 3A through 3D, fastener assembly comprised of track fastener 124 a, spacer 124 b, base fastener 124 (comprised of a cap and a threaded insert), spacer assembly 127, and threaded insert 128 slidably engages track 125 that may be attached to an installation surface (not shown). Similar to those discussed above, base plate 126 includes raised portion (similar to raised portion 107) having an aperture (similar to aperture 108) rising above or protruding from base plate 126. Spacer assembly 127 includes spacer 127 a, threaded insert 127 b, washer 127 c, and aperture 127 d rising above an upper surface of washer 127 c.

The fastener assembly couples base 122 to track 125. A threaded end of track fastener 124 a threadably engages complementary threads of a lower portion of spacer 124 b after extending through a groove of track 125; threaded insert 128 threadably engages complementary threads of both an upper portion of spacer 124 b and a lower portion of spacer 127 a after extending though aperture (similar to aperture 108) of the raised portion; and a threaded end of base fastener 124 c threadably engages complementary threads of aperture 127 d as it extends through both the aperture of base 122 (similar to aperture 102 a). In some embodiments, it is a lower portion of threaded insert 127 b that threadably engages complementary threads of aperture 127 d while an upper portion of threaded insert 127 b threadably engages complementary threads of an upper portion of the cap of base fastener 124 c after extending through the aperture the aperture of base 122. In some embodiments, a lower portion of such cap is conically flared to cover the horizontal leg aperture when such aperture is positioned over or against the aperture 127 d as the cap of base fastener 124 c is secured against base 122.

FIGS. 4A through 4C illustrate perspective, exploded, and perspective cutaway views, respectively, of fourth surface mount assembly 130. Height-adjustable mount 131 is slidably coupled to base 132 with fastener 133 extending through an elongated aperture for slidably coupling rail or track 139 to base 132. Fastener assembly comprised of track fastener 134 a, spacer 134 b, and base fastener 134 c slidably engages track 135 that may be attached to an installation surface (not shown). In some embodiments, base fastener 134 c is comprised of cap 134 d and threaded insert 134 e. Base plate 136 includes raised portion 137 rising above or protruding from base plate 136. In some embodiments, the edges of raised portion 137 are configured to fit a contour of a curved shape of base plate 136 employed to fit on a surface having a matching or complementary contour. In some embodiments, raised portion 137 includes apertures 138 a and 138 b.

The fastener assembly couples base 132 to track 135. In some embodiments, cap 134 d includes lower tier 134 f and upper tier 134 g for placement of cap 134 d over aperture 138 a. In some embodiments, an inner surface of upper tier 134 g is threaded for engaging complementary threads of threaded insert 134 e extending through aperture 138 a. In some embodiments, an inner surface of aperture 138 a is threaded for engaging complementary threads of threaded insert 134 e extending through aperture 138 a. In some embodiments, an inner surface of lower tier 134 f is positioned over an outer surface of aperture 138 a as cap 134 d is secured against base 132.

In some embodiments, raised portion 137 includes second aperture 138 b over which cap 134 h is placed. In some embodiments, cap 134 h could include cylindrical outer shell 134 i and concentric, threaded cylindrical member 134 j extending inside of and substantially parallel to cylindrical outer shell 134 i to form a cylindrical groove for the placement of cap 134 h over aperture 138 b. In some embodiments, an inner surface of aperture 138 b is threaded for engaging complementary threads of threaded cylindrical member 134 j. In some embodiments, an inner surface of cylindrical outer shell 134 i is positioned against an outer surface of aperture 138 b when cap 134 h is placed over aperture 138 b.

FIG. 4D illustrates a side view of track 139 which includes vertical wall 139 a and horizontal wall 139 b intersecting with one another to form corner 139 c. Vertical wall 139 a extends from corner 139 c until reaching flange 139 d, and horizontal wall 139 b extends substantially perpendicularly away from vertical wall 139 a until reaching flange 139 e. Flange 139 d extends substantially perpendicularly away from vertical wall 139 a and in the same direction as horizontal wall 139 b, and flange 139 e extends substantially perpendicularly away from horizontal wall 139 b and in the same direction as vertical wall 139 a.

In some embodiments, inner surfaces 139 f and 139 g of vertical wall 139 a and horizontal wall 139 b, respectively, are not straight. A portion 139 h of an inner surface 139 f approximately adjacent to flange 139 d protrudes away from vertical wall 139 a that, together with flange 139 d, form a lengthwise groove 139 i; similarly, a portion 139 j of an inner surface 139 g approximately adjacent to flange 139 e protrudes away from horizontal wall 139 b that, together with flange 139 e, form a lengthwise groove 139 k.

From a location between corner 139 c and flange 139 d, horizontal flange 139 l extends substantially perpendicularly away from vertical wall 139 a and in the same direction as horizontal member 139 b until flange 139 m is reached at its distal end. Flange 139 m extends substantially perpendicularly away from horizontal flange 139 l and in a direction towards horizontal wall 139 b. In some embodiments, flanges 139 e and 139 m are paired flanges. In some embodiments, outer surfaces of paired flanges 139 e and 139 m are collinear with one another. In some embodiments, outer surfaces of paired flanges 139 e and 139 m are textured to provide mating surfaces to facilitate an engagement with a separate structural component having complementary mating surfaces with matching or complementary textures.

In some embodiments, horizontal member 139 l includes first portion 139 n, second portion 139 o, and third portion 139 p that is substantially parallel to first portion 139 n. First portion 139 n extends substantially perpendicularly away from vertical wall 139 a until reaching one end 139 q of second portion 139 o, at which point second portion 139 o extends upwardly away from first portion 139 n until reaching an opposing end 139 r of second portion 139 o, at which point of third portion 139 p extends away from second portion 139 o until reaching flange 139 m. In some embodiments, flange 139 m forms one end of vertical wall 139 s.

Vertical wall 139 s extends substantially perpendicularly away from horizontal flange 139 l and until flange 139 t is reached at its distal end. Flange 139 t extends substantially perpendicularly away from vertical wall 139 s in a direction towards vertical wall 139 a. In some embodiments, flanges 139 d and 139 t are paired flanges. In some embodiments, outer surfaces of paired flanges 139 d and 139 t are collinear with one another. In some embodiments, outer surfaces of paired flanges 139 d and 139 t are textured to provide mating surfaces to facilitate an engagement with a separate structural component having complementary mating surfaces with matching or complementary textures.

In some embodiments, inner surface 139 u of vertical wall 139 s is not straight. A portion 139 v of inner surface 139 u approximately adjacent to flange 139 t protrudes away from vertical wall 139 s that, together with flange 139 t, form a lengthwise groove 139 w. In some embodiments, the distance of gap 139 x formed by flanges 139 d and 139 t is equal to gap 139 y formed by flanges 139 e and 139 m.

FIGS. 5A and 5B illustrate perspective and exploded views of fifth surface mount assembly 140. Extender 141 is vertically slidably coupled to base 142 with fastener 143 extending through elongated aperture 142 a, where fastener 143 is configured with threads to threadably engage complementary threads of aperture 141 a. Track 144 (same as track 139 in FIGS. 4A through 4C) is vertically slidably coupled to extender 141 with fastener 145 and mount 146. Fastener 145 extends through elongated aperture 141 b to threadably engage complementary threads of aperture 146 a. Mount 146 is horizontally slidable within height-adjustable track 144. In some embodiments, base 142 may be attached to an underlying structure (not shown) with fastener 147 extending through an aperture of base plate 148.

FIG. 5C illustrates side, top, and bottom views of extender 141 comprised having left side 141 c, right side 141 d, inner surface 141 e, and outer surface 141 f. First inner flange 141 g extends substantially perpendicularly away from inner surface 141 e and lengthwise along left side 141 c until reaching distal end 141 h.

From a location between left side 141 c and right side 141 d, second inner flange 141 i extends substantially perpendicularly away from inner surface 141 e and lengthwise until reaching distal end 141 j. In some embodiments, an imaginary line extending from distal end 141 h to distal end 141 j is substantially parallel to inner surface 141 e. When employed in fifth surface mount assembly 140, first and second inner flanges 141 g and 141 i engage paired flanges of track 144 to transfer a force imparted by tightening of fastener 145 and to lock mount 146 into place.

Aperture 141 b is located between first inner flange 141 g and second inner flange 141 i. In some embodiments, aperture 141 b is elongated lengthwise. When employed in fifth surface mount assembly 140, fastener 145 extends through aperture 141 b to engage mount 146.

From a location to the right of second inner flange 141 i, outer flange 141 k extends substantially perpendicularly away from outer surface 141 f until reaching distal end 141 l. In some embodiments, outer flange 141 k is located to the left of right side 141 d.

Aperture 141 a is located within outer flange 141 k. In some embodiments, aperture 141 a is threaded for engaging complementary threads of fastener 143 extending through aperture 142 a. When employed in fifth surface mount assembly 140, fastener 143 engages extender 141 a; when a tightening force is applied, extender 141 is drawn towards the vertical leg of base 142 until inner surface 141 e on the right side of flange 141 j engages a surface of base 142 to transfer a force imparted by tightening of fastener 143.

FIG. 6 illustrates a perspective view of sixth surface mount assembly 150. As illustrated, sixth surface mount assembly 150 is comprised of components of fifth surface mount assembly 140 and components of first surface mount assembly 100 to mount fifth surface mount assembly 140 (comprised of height-adjustable extender 141, base 142, fastener 143, height-adjustable track 144, fastener 145, and mount 146) to track 105 with fastener assembly comprised of track fastener 104 a, spacer 104 b, and base fastener 104 c.

FIGS. 7A and 7B illustrate first perspective and first exploded views of track-mounted rectangular base 160 which include rectangular base 161 with a pair of short-sided legs 162 (corresponding to the shorter side of the rectangle), a pair of long-sided legs 163 (corresponding to the longer side of the rectangle), and fastener 164 for engaging outer surfaces of track 165. Each short side of rectangular base 161 includes aperture 166, and each long side includes aperture 167. Aperture 168 is formed at an intersection of a pair of diagonal braces 169, each brace connecting opposite inner corners of rectangular base 161.

FIG. 7C illustrates a first side view of track-mounted rectangular base 160. As shown, base 161 engages track 165 with fastener 166 extending through apertures 166 of the short sides and aperture 168, where inner surfaces of the pair of short-sided legs 162 are placed adjacent to the outer surfaces of track 165 and/or the distal ends of short-sided legs 162 contact an upper surface of track 165.

FIGS. 7D and 7E illustrate second perspective and second exploded views of track-mounted rectangular base 160 employed differently than as shown in FIGS. 7A though 7C A second side view of track-mounted rectangular base 160 as employed in FIGS. 7D and 7E is illustrated in FIG. 7F. Here, base 161 engages track 165 with fastener 166 extending through apertures 167 of the long sides and aperture 168, where inner surfaces of the pair of short-sided legs 163 are placed adjacent to the outer surfaces of track 165 and/or the distal ends of long-sided legs 163 contact the upper surface the track 165.

It should be understood that the aspects, features and advantages made apparent from the foregoing are efficiently attained and, since certain changes may be made in the disclosed inventive embodiments without departing from the spirit and scope of the invention, it is intended that all matter contained herein shall be interpreted as illustrative and not in a limiting sense. 

What is claimed is:
 1. A surface mount assembly for mounting to a solar panel frame to an installation surface, comprising: a base configured with at least one aperture; a track; a plate configured with a raised portion, wherein the raised portion includes at least one aperture extending away from a surface of the raised portion; and a fastener assembly configured for coupling the base to the track and comprised of a first fastener, a second fastener, and a spacer, wherein the first fastener extends upwardly from the track to threadably engage a threaded aperture of a first end of the spacer, and wherein the second fastener extends downwardly through one base aperture and one plate aperture to threadably engage a threaded aperture of a second end.
 2. The surface mount assembly of claim 1, wherein the track is coupled to an installation surface.
 3. The surface mount assembly of claim 1, wherein the base is L-shaped, wherein a horizontal arm of the L-shaped base is configured with the one base aperture.
 4. The fastener assembly of claim 1, wherein the threaded aperture of a first end and the threaded aperture of a second end are the same aperture or individual apertures.
 5. The surface mount assembly of claim 1, wherein the second fastener is comprised of a threaded cap and a threaded insert, wherein the threads of the second fastener are first threads of the threaded insert, and wherein second threads of the threaded insert engage threads of the threaded cap.
 6. The surface mount assembly of claim 5, wherein the threaded cap is further comprised of a first portion and a second portion, wherein threads of the threaded cap are located in the first portion.
 7. The surface mount assembly of claim 6, wherein an outer surface of the second portion is conically flared.
 8. The surface mount assembly of claim 6, wherein the first portion and the second portion are tiered.
 9. The surface mount assembly of claim 5, wherein the one plate aperture is a threaded aperture extending substantially perpendicularly away from the surface of the raised portion, wherein the second threads of the threaded insert further engage threads of the threaded aperture.
 10. The surface mount assembly of claim 9, wherein a second plate aperture is a threaded aperture extending substantially perpendicularly away from the surface of the raised portion.
 11. The surface mount assembly of claim 9, further comprising: a threaded cap configured to threadably engage the second plate aperture.
 12. The surface mount assembly of claim 11, wherein the threaded cap is comprised of an outer shell, and a concentric, threaded cylindrical member extending substantially perpendicularly from a horizontal inner surface of the outer shell and substantially parallel to a cylindrical vertical inner surface of the outer shell to form a cylindrical groove for covering a cylindrical wall of the second plate aperture.
 13. A fastener assembly, comprising: a first fastener, a second fastener, and a spacer, wherein threads of the first fastener engage a threaded aperture of a first end of the spacer, and wherein threads of the second fastener engage a threaded aperture of a second end.
 14. The fastener assembly of claim 13, wherein the threaded aperture of a first end and the threaded aperture of a second end are the same aperture or individual apertures.
 15. The fastener assembly of claim 13, wherein the second fastener is comprised of a threaded cap and a threaded insert, wherein the threads of the second fastener are first threads of the threaded insert, and wherein second threads of the threaded insert engage threads of the threaded cap.
 16. The fastener assembly of claim 15, wherein the threaded cap is further comprised of a first portion and a second portion, wherein threads of the threaded cap are located in the first portion.
 17. The fastener assembly of claim 16, wherein an outer surface of the second portion is conically flared.
 18. The fastener assembly of claim 16, wherein the first portion and the second portion are tiered.
 19. The fastener assembly of claim 15, further comprising: a plate comprising of a threaded aperture extending substantially perpendicularly away from the plate, wherein the second threads of the threaded insert further engage threads of the threaded aperture.
 20. A threaded cap, comprising: an outer shell, and a concentric, threaded cylindrical member extending substantially perpendicularly from a horizontal inner surface of the outer shell and substantially parallel to a cylindrical vertical inner surface of the outer shell to form a cylindrical groove.
 21. The threaded cap of claim 20, wherein the outer shell is cylindrical.
 22. A track, comprising: a first vertical wall; a second vertical wall; and a horizontal wall, and a horizontal flange, such that an intersection the first vertical wall and the second vertical wall forms a corner, the first vertical wall extends from the corner until reaching a first flange, the horizontal wall extends substantially perpendicularly away from first vertical wall until reaching a second flange, the horizontal flange extends substantially perpendicularly away from a location on the first vertical wall between the corner and the first flange until reaching a third flange at its distal end, and the second vertical wall extends substantially perpendicularly away from the horizontal flange and the horizontal wall until reaching a fourth flange.
 23. The track of claim 22, wherein the horizontal flange is comprised of a first portion, a second portion, and a third portion, wherein the first portion extends substantially perpendicularly away from the first vertical wall until reaching a first end of the second portion, the second portion extends upwardly away from the first portion until reaching a second end of the second portion, and the third portion extends away from the second portion until reaching the third flange.
 24. The track of claim 22, wherein the first flange extends substantially perpendicularly away from the first vertical wall and in the same direction as the horizontal wall extends from the first vertical wall, the second flange extends substantially perpendicularly away from the horizontal wall and in the same direction as the first vertical wall extends from the corner, the third flange extends substantially perpendicularly away from the horizontal flange and towards the horizontal wall, and the fourth flange extends substantially perpendicularly away from the second vertical wall and towards the first vertical wall.
 25. The track of claim 22, wherein a gap formed between the first and fourth flanges is equal to a gap formed between the second and third flanges.
 26. The track of claim 22, wherein horizontal surfaces on the first and fourth flanges are textured, and vertical surfaces on the second and third flanges are textured.
 27. The track of claim 22, wherein horizontal surfaces on the first and fourth flanges are collinear with each other, and vertical surfaces on the second and third flanges are collinear with each other.
 28. The track of claim 22, wherein a first lengthwise groove is formed by the first flange and a protrusion of an inner surface of the first vertical wall approximately adjacent to the first flange, a second lengthwise groove is formed by the second flange and a protrusion of an inner surface of the horizontal wall approximately adjacent to the second flange, a third lengthwise groove is formed by the third flange and a protrusion of an inner surface of the horizontal flange approximately adjacent to the third flange, and a fourth lengthwise groove is formed by the fourth flange and a protrusion of an inner surface of the second vertical wall approximately adjacent to the fourth flange. 